package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.google.gson.JsonObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    //微信服务接口地址
    public static final String WX_LOGIn="https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登录
     */
    public User wxLogin(UserLoginDTO userLoginDTO){
        //调用微信接口服务，获取当前微信用户的openid
        String openid=getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，若为空，则抛出异常，登陆失败
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断微信用户对于当前外卖系统是否是新用户
         User user=userMapper.getByOpenid(openid);
        //如果是新用户，则自动完成注册
        if(user==null){
            user=User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        //返回用户对象
        return user;
    }
    //将获取微信openid的方法抽取出来
    private String getOpenid(String code){
        //调用微信接口服务，获取当前微信用户的openid
        Map<String,String>map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIn, map);

        JSONObject jsonObject= JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
